Astronomical sphere

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“Armillary Sphere, an instrument used in astronomy. In its simplest form, consisting of a ring fixed in the plane of the equator, the armilla is one of the most ancient of astronomical instruments. Slightly developed, it was crossed by another ring fixed in the plane of the meridian.” — The Encyclopedia Britannica, 1910

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In this article, we'll explore how the armillary sphere works, what the rings on it show, and how it helps visualize the movement of the Sun on the celestial sphere.

For background see: bibliodyssey.blogspot.com/2010/11/celestial-mechanics.html

A treatise describing the construction, and explaining the use, of new celestial and terrestrial globes : designed to illustrate in the most easy and natural manner, the phoenomena of the earth and heavens, and to shew the correspondence of the two spheres : with a great variety of astronomical and geographical problems : George Adams : Free Download, Borrow, and Streaming : Internet Archive